LEGO 5103 Pneumatic Spring Cylinder 48 mm Red is a vintage Service Packs set from 1987 valued at $8 for new and sealed sets, up 310% from an original retail price of $1.99. Annual appreciation has averaged 4.40% since release. Used copies are valued between $7 and $10 depending on condition.
LEGO 5103-1 Pneumatic Spring Cylinder 48 mm Red is a Service Packs Technic set released in 1987, containing 1 piece. It includes the first-version red pneumatic pump/spring cylinder component used in early Technic pneumatic systems, designated at 48 mm length.
A new and sealed Pneumatic Spring Cylinder 48 mm Red is currently valued at around $8, with annual growth of approximately 4%, which is higher than other Technic sets. The average used price is $8 for those in good overall condition. Based on current trends, this set could be valued near $9 within the next year. New and sealed listings currently range from $8 to $10.